Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: question: Nomeie o número do distrito para bill shuster
 ###Tabelas: CREATE TABLE pga_tour_professional_career_summary (pga_tour_professional_career_summary_id AUTO_INCREMENT PRIMARY KEY, Year INT, Starts INT, Cuts made VARCHAR, Wins (Majors) VARCHAR, 2nd INT, 3rd INT, Top 10 INT, Top 25 INT, Earnings ($) INT, Money list rank INT, Adjusted scoring average (rank) VARCHAR) CREATE TABLE pennsylvania (pennsylvania_id AUTO_INCREMENT PRIMARY KEY, District VARCHAR, Incumbent VARCHAR, Party VARCHAR, First elected INT, Result VARCHAR, Candidates VARCHAR) CREATE TABLE current_women's_teams (current_women's_teams_id AUTO_INCREMENT PRIMARY KEY, Institution VARCHAR, Location VARCHAR, Nickname VARCHAR, Enrollment INT, Established INT) CREATE TABLE children (children_id AUTO_INCREMENT PRIMARY KEY, Name VARCHAR, Other names VARCHAR, Birth VARCHAR, Death VARCHAR, Death Place VARCHAR, Mother VARCHAR) CREATE TABLE spring_1999 (spring_1999_id AUTO_INCREMENT PRIMARY KEY, 7:00 am VARCHAR, 7:30 am VARCHAR, 8:00 am VARCHAR, 9:00 am VARCHAR, 11:00 am VARCHAR, noon VARCHAR, 12:30 pm VARCHAR, 1:00 pm VARCHAR, 1:30 pm VARCHAR, 2:00 pm VARCHAR, 3:00 pm VARCHAR, 3:30 pm VARCHAR, 4:00 pm VARCHAR, 4:30 pm VARCHAR, 5:00 pm VARCHAR, 6:30 pm VARCHAR)  
SELECT COUNT District FROM pennsylvania WHERE Incumbent = Bill Shuster